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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Tyre Size for Spare

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Old Sep 18, 2017 | 07:21 AM
  #1  
Dean8020's Avatar
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From: Hampshire, UK
Tyre Size for Spare

Hi again,

I couldn't find a 'tyre' category to post this in, so I have come back here!

I am struggling to find a spare wheel for my truck (over in the UK) at a reasonable price. I don't want to buy something brand new at silly money.

I managed to get a steel wheel from a modern car with a matching PCD 5x5.5, which fits on ok.

Now I am trying to find a suitable tyre for it.

The truck is fitted with 235/75R15

The new wheel came new with 205/70R15

I (incorrectly) assumed that 205/75R15 would come out at the same diameter as 235/75R15.

But I was wrong.

Now I can't seem to find a 205 tyre size which has the same diameter as the truck ones.

And am I stressing over nothing, I don't want the rear wheels turning at different speeds through the diff?

I have now confused myself with all the sizes, and arrived here for help!
 
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Old Sep 18, 2017 | 07:32 AM
  #2  
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From: tucson
If you get a flat on the rear, just put the spare on the front and then put the front on the rear.
 
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Old Sep 18, 2017 | 08:23 AM
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Um, why not just get a 235/75R15 as a spare? Even if the rim width is off a touch, it will work just fine...
 
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Old Sep 18, 2017 | 08:35 AM
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The size difference won't really matter in the short run if you have an open differential.
Eric.
 
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Old Sep 18, 2017 | 06:30 PM
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What 6t6merc said. It won't matter with an open differential.
 
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Old Sep 26, 2017 | 06:29 AM
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Cheers for the input.

I put a 225/75 R15 on it, which is only about 1/2" different in diameter.
 
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